Why the Northern Lights Are Visible over U.S.
http://www.newsweek.com/northern-lights-geomagnetic-storm-over-us-cme-1796515
Spectacular ripples of green, purple and red lights were seen across the U.S. and Canada on Sunday night, much further south than normal.
Photos on social media captured the gorgeous light shows in the night sky as far south as California, as well as in Illinois, Wyoming and Nevada.